Astronomy:Phi Fornacis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Fornax |
| Right ascension | 02h 28m 01.70348s[1] |
| Declination | −33° 48′ 39.7382″[1] |
| Apparent magnitude (V) | 5.13[2] |
| Characteristics | |
| Spectral type | A2.5V[3] |
| B−V color index | +0.089±0.003[2] |
| Astrometry | |
| Radial velocity (Rv) | +19.0±4.2[4] km/s |
| Proper motion (μ) | RA: +18.526[1] mas/yr Dec.: +5.163[1] mas/yr |
| Parallax (π) | 21.1604 ± 0.1410[1] mas |
| Distance | 154 ± 1 ly (47.3 ± 0.3 pc) |
| Absolute magnitude (MV) | 1.79[2] |
| Details | |
| Mass | 2.11[5] M☉ |
| Radius | 1.74[6] R☉ |
| Luminosity | 16.66[2] L☉ |
| Surface gravity (log g) | 4.27[5] cgs |
| Temperature | 9,449±321[5] K |
| Rotational velocity (v sin i) | 116.8±0.8[7] km/s |
| Age | 238[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Phi Fornacis is a single[9] star in the southern constellation of Fornax. It has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of 5.13.[2] The distance to this object is approximately 154 light-years based on parallax,[1] and it is drifting further away with a radial velocity of +19 km/s.[4]
This is an A-type main-sequence star with a stellar classification of A2.5V.[3] Phi Fornacis is 238[5] million years old and is spinning with a projected rotational velocity of 117 km/s.[7] It has 2.1[5] times the mass of the Sun and 1.7[6] times the Sun's radius. The star is radiating 17[2] times the luminosity of the Sun from its photosphere at an effective temperature of 9,449 km/s.[5] It displays an infrared excess, suggesting a circumstellar disk[10] of dust is orbiting the star at a distance of 30.2 astronomical unit|AU with a mean temperature of 100 K.[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Abt, Helmut A.; Morrell, Nidia I. (July 1995), "The relation between Rotational Velocities and Spectral Peculiarities among A-type stars", The Astrophysical Journal Supplement Series 99: 135–172, doi:10.1086/192182, Bibcode: 1995ApJS...99..135A
- ↑ 4.0 4.1 Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.
- ↑ 6.0 6.1 6.2 Cotten, Tara H.; Song, Inseok (July 2016), "A Comprehensive Census of Nearby Infrared Excess Stars", The Astrophysical Journal Supplement Series 225 (1): 24, doi:10.3847/0067-0049/225/1/15, 15, Bibcode: 2016ApJS..225...15C.
- ↑ 7.0 7.1 Díaz, C. G. et al. (July 2011), "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum", Astronomy & Astrophysics 531: A143, doi:10.1051/0004-6361/201016386, Bibcode: 2011A&A...531A.143D.
- ↑ "* phi For". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+phi+For.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ Chen, Christine H. et al. (2014), "The Spitzer Infrared Spectrograph Debris Disk Catalog. I. Continuum Analysis of Unresolved Targets", The Astrophysical Journal Supplement 211 (2): 22, doi:10.1088/0067-0049/211/2/25, 25, Bibcode: 2014ApJS..211...25C.
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